physics
posted by Noah .
A 2.2 kg rock initially at rest loses 412 J of potential energy while falling to the ground. Assume that air resistance is negligible.
Calculate the kinetic energy that the rock gains while falling.
What is the rock's speed just before it strikes the ground?

KE=ΔPE=412 J
mv²/2=mgh
v=sqrt(2gh)
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